As a scientist, Carl is concerned with the intensity of lights in the modern human environment. In his research project, Group A consists of volunteers who have agreed to sleep each night for a week with a 150 watt light bulb hanging over their bed. Group B will sleep in total darkness, and Group C will sleep in their usual environment. Alertness, blood pressure, respiration rate, and muscle tension will be sampled in the morning and evening. Carl is studying: (Points: 5)
light perception.
the relationship between mood and sleep.
gerontology.
psychophysics.
I believe it is psychophysics

Psychophysics studies the relation between physical stimuli and a person's sensations and/or perceptions.

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